EL MONTE, Calif. -- A young man suspected of participating in a California street race that killed a woman and her two children has been arrested in Mexico.

Police in La Presa, 10 miles south of Tijuana, turned Martin Morones over to U.S. marshals after his arrest late Monday, the Los Angeles Times reported. Bail was set at $3 million.

Morones, 21, and Robert Canizalez, 19, were allegedly involved in an Oct. 8 race in El Monte, east of Los Angeles. Canizalez allegedly hit a car driven by Dora Groce as she pulled out of a trailer park.

Investigators say Groce was killed immediately but her two young children may have died in the flames that consumed the car. Canizalez was arrested immediately, while Morones fled.

El Monte police notified police in La Presa that the suspect had relatives there, police said at a news conference. His car was spotted in a parking lot Monday.

Both Morones and Canizalez face three counts of murder.

Stephen Groce called Morones a "coward" Tuesday for leaving the scene after helping to cause the crash that killed his wife and children.